US3545889A - Centrifugal pumps - Google Patents

Centrifugal pumps Download PDF

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Publication number
US3545889A
US3545889A US769092A US3545889DA US3545889A US 3545889 A US3545889 A US 3545889A US 769092 A US769092 A US 769092A US 3545889D A US3545889D A US 3545889DA US 3545889 A US3545889 A US 3545889A
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US
United States
Prior art keywords
motor
resistance
pump
casing
resistance element
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US769092A
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English (en)
Inventor
Philip Pensabene
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sealed Motor Construction Co Ltd
Original Assignee
Sealed Motor Construction Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sealed Motor Construction Co Ltd filed Critical Sealed Motor Construction Co Ltd
Application granted granted Critical
Publication of US3545889A publication Critical patent/US3545889A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D13/00—Pumping installations or systems
    • F04D13/02—Units comprising pumps and their driving means
    • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D13/0666—Units comprising pumps and their driving means the pump being electrically driven the motor being of the plane gap type
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K17/00—Asynchronous induction motors; Asynchronous induction generators
    • H02K17/02—Asynchronous induction motors
    • H02K17/30—Structural association of asynchronous induction motors with auxiliary electric devices influencing the characteristics of the motor or controlling the motor, e.g. with impedances or switches
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/12—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas
    • H02K5/128—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas using air-gap sleeves or air-gap discs
    • H02K5/1282—Casings or enclosures characterised by the shape, form or construction thereof specially adapted for operating in liquid or gas using air-gap sleeves or air-gap discs the partition wall in the air-gap being non cylindrical

Definitions

  • This invention relates to centrifugal pumps and particularly to pumps constructed as electric motorised units for use in hot water circulating systems.
  • a typical motorised pump unit may employ an electric disc or drum type motor or a shaded pole motor, and the invention is particularly directed to controlling the performance of pump units driven by A.C. induction motors.
  • an electric motorised centrifugal pump unit driven by an A.C. induction motor has the stator winding provided with a resistance control device of which at least one resistance control element is embodied within and in heat conducting connection with a casing portion of the unit and in a position adjacent to the water circulating channel of the pump.
  • the embodied resistance control element may be a single or a multi-section iixed or variable resistance and may be connected in series or parallel with the stator winding of the motor. Adjustment of the effective resistance value in the stator winding circuit of the motor may be provided by a rotary switch or a plugging device or a push-on terminal arrangement, so connected as to vary sections of the resistance so that respective sections may be brought into use as required, or a separate variable control network may be connected to the embodied resistance element to enable the effective resistance in the stator circuit of the motor to be varied from a remote point for altering speed of the pump.
  • the adjustment means referred to may be mounted in the motorised unit or may be constructed as a remote control.
  • the A.C. electric motor preferred for this invention is one which has a low ux high leakage arrangement, providing a similar characteristic to a commutator type series wound motor where the speed falls steadily to zero and does not have any specific pull-out point.
  • the high 3,545,889 Patented Dec. 8, 1970 ICC leakage drum-type, disc-type or shaded pole motor is particularly suited to the control device of the invention.
  • any excessive heat generated by the resistance element during the controlling operation disperses through the casing of the unit and may therefore be absorbed by the water flowing through the pump circulating channel, thereby improving the eiiiciency, because normally such heat would be a total loss.
  • FIG. 1 shows in cross-section one example of the stator end of a typical centrifugal pump unit with one form of single element resistance forming a part of the control device with an adjustable switch for varying the resistance mounted on the unit casing, and
  • FIG. 2 is a similar view to FIG. l, but with an alternative form of resistance element.
  • the drawing shows the invention applied to a glandless circulating pump suitable for water circulating systems, the A.C. motor being of the disc type such as that shown, for example, in a centrifugal pump unit disclosed in British patent speciiication No. 978,683.
  • the pump casing 1 has a water channel 2 leading to the rotor impeller 3 which is separated from the stator 4 of the electric motor by a shroud in the form of a flat disc 5.
  • the stator is enclosed by a Winding 6 adapted for connection in an appropriate electric circuit ⁇ (not shown).
  • the stator assembly is enclosed by a motor casing part 7 which is secured in any suitable manner to the pump casing part 1.
  • the control device for controlling the iiow of electric current through the stator winding of the motor includes a resistance element ⁇ 8 which in FIG. 1 is secured (for example by being cemented) into a housing 9 in a portion 10 of the motor casing 7, this casing portion 10 being located as shown, adjacent to the wall 1a of the water flow channel 2 and xed in heat conducting contact therewith, so that any heat generated in the housing 9 from the resistance element 8 is dissipated through the casing parts 10, 1a, into the water circulating in the channel 2.
  • the resistance element 8 in the arrangement shown is connected to switching means 11 which enables sections of the resistance element to be varied or brought into use as may be required for controlling the speed of the motor.
  • this switching means is essentially typical of only one aspect of the invention, which may employ any suitable form of control including a stator control circuit with one or more external resistances which may be in parallel or in series with the heat conducting resistance element 8, and which provide adjustment enabling the current flow to be varied in the stator winding by appropriate adjustment of the variable element(s) of the control circuit.
  • the type of motor may be as suitable for the purpose of the particular application of the unit, but generally it will be a disc type motor as shown, or a conventional drum type including a shaded pole motor. Furthermore, a separate control box mounted away from the unit but connected electrically with the resistance element therein may be employed to give the remote control indicated above.
  • the resistance control element which is mounted adjacent to the water channel of the pump may in fact be embodied in heat conducting connection in the pump casing part 1, and there may be one or more of these resistance control elements distributed in any suitable casing part for the purpose of dissipating heat to the water channel, as may be required.
  • appropriate conducting channels or members may be associated with the housing for the resistance element or elements 8 to give an improved heat conduction if this is found to be necessary or desirable; one form of this modification is shown in FIG, 2.
  • the switching arrangement of the control device for bringing in the resistance element(s) 8 may, as shown, be mounted in any suitable position on the motor casing or the pump casing, and in general will be enclosed by an appropriate housing cover such as 12.
  • FIG. 2 an alternative method of mounting the resistance element 8 is shown.
  • the element 8 is a flat unit and instead of cementing it into the housing 9, the latter is constituted on one side by a clamping plate 13, and the ilat resistance element 8a is clamped between the plate 13 and a parallel clamping surface 14 of the housing 9 in the motor casing 7, by, for example, a screw clamp 15, the arrangement being such that intimate heat conducting contact is obtained between 4 the various parts to provide effective heat transference to the 'water channel 2.
  • machined at surfaces 16 may fbe interposed between the flat resistance element 8a and the clamping surfaces, or other suitable heat conducting members may be provided.
  • a centrifugal pump unit comprising a casing embodying a water circulation channel and enclosing an A.C. induction motor of the disc type having a Wound stator and a rotor impeller, said stator being separated from the impeller by a shroud in said casing which forms part of said Water channel, said casing having a part which encloses the stator and which is provided with a resistance housing portion in heat exchange connection with a wall of the said water channel, and an adjustable resistance control device for controlling electric current ilow through the stator winding, said device having at least one resistance element mounted in said housing portion to effect transfer of heat through said wall when current ows through the resistance element.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)
US769092A 1967-11-16 1968-10-21 Centrifugal pumps Expired - Lifetime US3545889A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB52272/67A GB1187866A (en) 1967-11-16 1967-11-16 Improvements in and relating to Electric Motorised Centrifugal Pumps.

Publications (1)

Publication Number Publication Date
US3545889A true US3545889A (en) 1970-12-08

Family

ID=10463287

Family Applications (1)

Application Number Title Priority Date Filing Date
US769092A Expired - Lifetime US3545889A (en) 1967-11-16 1968-10-21 Centrifugal pumps

Country Status (10)

Country Link
US (1) US3545889A (de)
AT (1) AT291486B (de)
BE (1) BE723915A (de)
CH (1) CH478987A (de)
DE (1) DE1808856B2 (de)
DK (1) DK137051B (de)
FR (1) FR1591443A (de)
GB (1) GB1187866A (de)
NL (1) NL148752B (de)
NO (1) NO122083B (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2500578A1 (de) * 2011-03-12 2012-09-19 Grundfos Management a/s Heizungsumwälzpumpe

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2920313C2 (de) * 1979-05-19 1983-02-03 Grundfos Pumpenfabrik GmbH, 2362 Wahlstedt Temperaturabhängig gesteuerte Umwälzpumpe für Heizungsanlagen
EP0105687A1 (de) * 1982-09-27 1984-04-18 Milton Roy Co. Elektronisch kommutierte elektrische Pumpe
GB8326354D0 (en) * 1983-10-01 1983-11-02 Lucas Ind Plc Fuel pumping apparatus
DE3642729C3 (de) * 1986-12-13 1997-05-07 Grundfos Int Pumpenaggregat zur Förderung von Flüssigkeiten oder Gasen
DE3642726A1 (de) * 1986-12-13 1988-06-23 Grundfos Int Drehzahlgeregeltes pumpenaggregat
DE3642727A1 (de) * 1986-12-13 1988-06-23 Grundfos Int Unterwasser-motorpumpe
DE4121430C1 (de) * 1991-06-28 1992-11-05 Grundfos International A/S, Bjerringbro, Dk
DE4222394C1 (de) * 1992-07-08 1993-12-09 Grundfos A S Bjerringbro Motorpumpe
DE4438132A1 (de) * 1994-10-27 1996-05-02 Wilo Gmbh Spaltrohrpumpe

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2707440A (en) * 1951-07-21 1955-05-03 Shell Dev Oil well pump control system
US2782721A (en) * 1949-08-19 1957-02-26 Howard T White Motor driven pumps
US3262394A (en) * 1964-08-19 1966-07-26 Ingersoll Rand Co Boiler feed pump control system
US3364866A (en) * 1964-08-17 1968-01-23 Teikoku Denki Seisakusho Kk Device for lubricating pump bearings and balancing axial thrust thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2782721A (en) * 1949-08-19 1957-02-26 Howard T White Motor driven pumps
US2707440A (en) * 1951-07-21 1955-05-03 Shell Dev Oil well pump control system
US3364866A (en) * 1964-08-17 1968-01-23 Teikoku Denki Seisakusho Kk Device for lubricating pump bearings and balancing axial thrust thereof
US3262394A (en) * 1964-08-19 1966-07-26 Ingersoll Rand Co Boiler feed pump control system

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2500578A1 (de) * 2011-03-12 2012-09-19 Grundfos Management a/s Heizungsumwälzpumpe
WO2012123234A1 (de) * 2011-03-12 2012-09-20 Grundfos Management A/S Heizungsumwälzpumpe
CN103443470A (zh) * 2011-03-12 2013-12-11 格伦德福斯管理联合股份公司 供热循环泵
US9879681B2 (en) 2011-03-12 2018-01-30 Grundfos Management A/S Heating circulation pump

Also Published As

Publication number Publication date
DK137051B (da) 1978-01-09
BE723915A (de) 1969-04-16
FR1591443A (de) 1970-04-27
DE1808856B2 (de) 1973-05-10
NO122083B (de) 1971-05-18
GB1187866A (en) 1970-04-15
AT291486B (de) 1971-07-12
DK137051C (de) 1978-06-12
NL6816291A (de) 1969-05-20
NL148752B (nl) 1976-02-16
DE1808856A1 (de) 1969-07-17
CH478987A (fr) 1969-09-30

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